Portable sanitation unit



FIG. 1 is a perspective view of a portable sanitation unit showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a side view thereof; and

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a portable sanitation unit, substantially as shown. 